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Crevice Corrosion in a Subsea System — Aspect Before Analysis

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Austenitic Stainless Steel + Austenite · 20 cases Low Alloy Medium Carbon QT + O&G Well Drilling · 13 cases Rolled Plate + Ferritic pearlitic · 13 cases Hydrogen Embrittlement + Subsea · 11 cases O&G Well Drilling + Tempered Martensite · 11 cases Typical manufacturing + Ferritic pearlitic · 9 cases

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Subsea drill pipe steel Hydrogen embrittlement Stainless steel in the chemical industry Welding defects in pressure vessels Subsea nickel alloys

From the archive

Aspect of a crevice corrosion of the flange, under the bolt head, showing evidences that the cathodic protection system was not connected to the stainless steel instrument.

1434

ML00122 / Feb.2018

Crevice Corrosion in a Subsea System

M - Austenitic Stainless SteelP - CaseAp - Oil and GasCd - Crevice

Cm - Aspect Before AnalysisDf - Localized Corrosion

Draft of the completion riser after removal of the external case showing the hydraulic line position where the 316 tubing is welded by orbital autogenous GTAW to the Nitronic fitting (stab). In the design of these hydraulic lines, the position of the cracking in the fitting is associated to a slightly bent condition of the fitting due to the misaligment of the tubing axis and the stab axis in the connector, visible in the draft.

1081

ML00095 / Sep.2017

MIC of a Riser Control Line

M - Austenitic Stainless SteelP - Fabrication WeldAp - Oil and GasCd - Brittle Behavior

Cm - Identification drawingDf - General View

Aspect of the fitting welded to a tubing, ND 5/8" in a hydraulic line. The through wall cracking is longitudinal in the fitting side.

1031

ML00094 / Sep.2017

MIC of a Subsea Hydraulic Line

M - Super Duplex Stainless SteelP - Fabrication WeldAp - SubseaCd - Brittle Behavior

Cm - Aspect Before AnalysisDf - General View

Micrographic detail of a longitudinal section of the pin, at the fracture position, showing secondary cracks with intergranular and transgranular morphology.

59

ML00009 / Sep.2017

Hydrogen Cracking of a 5" Drill Pipe S135

M - Low Alloy Medium Carbon QTP - Drill PipeAp - SubseaCd - Hydrogen Embrittlement

Cm - Nital Etched Micrography by OMDf - Brittle Cracks

Detail of the pin fracture surface, presenting both a flat aspect and a rough aspect in a shearing section of 2.5 mm width.

726

ML00046 / Jan.2018

Brittle Fracture of SS Shear Pin

M - Martensitic Stainless SteelP - Machined PartAp - EnergyCd - Intergranular Cracking

Cm - Fractography by SEMDf - Fracture

Aspect of the rusted knife, before cleaning.

1195

ML00054 / Dec.2018

Cutlery Corrosion

M - Martensitic Stainless SteelP - Foodstuff ArticleAp - KitchenCd - Pitting Corrosion

Cm - Aspect Before AnalysisDf - Corrosion

The repair weld presented several cracks in the weld metal, transverse to the weld, detected during inspection using magnetic particle test. The cracks were mainly located in regions of the structure where the repair was conducted by welding in the vertical position using 1/8" stick electrode.

709

ML00010 / Oct.2017

Cold Cracks in a Gouged Weld Metal

M - Low Alloy Low Carbon QTP - Rolled PlateAp - OffshoreCd - Welding Defect

Cm - Aspect by NDTDf - Cracking

The internal surface of the 2 1/2" thickness plate drum was welded to attach a baffle plate (1/4" thick) using two fillets (one in each side of the plate to shell), but the welding procedure was not suitable since cracks appeared underbead, although they were detected only after 6 month in operation, when the baffle was removed. The picture shows a macrography of the surface, with the cracking.

698

ML00008 / Nov.2017

Cold Cracks in CMn Steel Pressure Vessel

M - CMn SteelP - In Field WeldAp - BoilerCd - Welding Defect

Cm - NItal Etched MacroDf - Cracking